A universal joint consists of bearing assemblies connected by a crossmember called a spider (2). The spider is shaped like a cross and has arms of equal length. The bearings used in universal joints are the needle roller type and revolve around the ends of the spider inside bearing caps which act as races. The bearing caps (1) are fitted into the propeller shaft yokes and are held in place with snap rings. The universal joint is designed to handle the effects of various loadings and axle windup during acceleration.

The universal joints will operate safely and efficiently within design angle variations. When the design angle is changed or exceeded, the operational life of the joint may decrease. Universal joints are lubricated and sealed during manufacturing and do not require maintenance. If a universal joint becomes noisy or worn, it must be replaced as an assembly.